Hariom Singh

Dec 21, 2016 16:12 IST

Find important formulae from the unit Concepts of Optics for quick revision. This unit contributes about 10 percent of total questions in any entrance examinations.When exams are round the corner then it is not possible to revise complete books so we have come up with unit wise formulae and important terms. Once you have gone through chapters thoroughly and understood it well there is no need to study it again and again. You can only revise important formulas and terms which will save your precious time.

In this regard find Concepts of Optics important Formulae for Quick Revision. These formulae will be helpful in various engineering entrance examinations. In UPSEE and WBJEE where most of questions are asked directly on formulae, this quick revision note is very important.

Concepts of Optics

Reflection

The incident ray, reflected ray and the normal to the reflecting surface lie in the same plane.

The Cartesian sign convention tells us which distance should be taken positive and which should be taken negative.

The incident ray, the refracted ray and the normal to the interface at the point of incidence, all lie in the same plane.

The ratio of the sine of the angle of incidence to the sine of angle of refraction is constant. Remember that the angles of incidence (i ) and refraction (r ) are the angles that the incident and its refracted ray make with the normal, respectively.